Dell Precision 7730 Service Manual page 24

b Insert the hard drive assembly into its slot in the system [1].
c Flip down the tab at the end of the hard drive assembly [2].
d Replace the 4 (M2.5x3.0) screws to secure the hard drive assembly to the system [3].
e Slide the hard drive release latch into the lock position [4].
2 Install the:
a battery cover
b SD card
3 Follow the procedure in
24 Removing and installing components
After working inside your computer.